Sports helmet

ABSTRACT

A sports helmet, in particular a bicycle helmet, a motorcycle helmet, a riding helmet or a ski helmet, comprises a shock-absorbing helmet shell and a strap fixing system for fixing the helmet shell to a user&#39;s head. The sports helmet comprises an airbag device which comprises at least one gas generator and at least one airbag which is inflatable by gas, wherein the at least one airbag is configured to protect at least a portion of the user&#39;s face in an inflated state.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit and priority of German Patent Application No. 102021130533.0 filed on Nov. 22, 2021 and German Utility Model Application No. 202022100276.2 filed on Jan. 19, 2022. The entire disclosures of the above applications are incorporated herein by reference.

FIELD

The invention relates to a sports helmet, in particular a bicycle helmet, a motorcycle helmet, a riding helmet or a ski helmet, having a shock-absorbing helmet shell and a strap fixing system for fixing the helmet shell to the head of a user.

BACKGROUND OF THE INVENTION

A sports helmet serves to protect the user against head injuries, particularly in the event of a fall. For this purpose, the sports helmet includes a helmet shell having a generally concave shaped inner side facing the user's head and a generally convex shaped outer side facing away from the user's head. In the event of an impact, the helmet shell should absorb to the greatest extent possible the kinetic energy acting on the sports helmet through inelastic and/or elastic deformation. Furthermore, a strap fixating system may be mounted at the helmet shell, by means of which the helmet shell may be fixed to the user's head and which may comprise, for example, a plurality of neck and chin straps.

In the present context, the term “sports helmet” is to be understood broadly and refers not only to helmets designed exclusively or specifically for the practice of a sport (such as a riding helmet or a ski helmet), but may also be used, for example, for a recreational activity (e.g. as a bicycle helmet or motorcycle helmet).

Such sports helmets in different variations are known. In general, a distinction may be made between sports helmets having rigid chin bars (e.g. for mountain-biking sport) and sports helmets without chin bars. In particular, sports helmets without chin bars are characterized by a high level of wearing comfort compared to sports helmets with rigid chin bars due to their open construction and relatively low weight. Sports helmets without chin bars are also far more widespread than sports helmets with rigid chin bars. However, sports helmets without chin bars do not offer comparable protection of a user's facial area. Thus, for certain impacts, in particular a user's chin region and/or regions of the cheekbone may be exposed to injury because a sports helmet without a chin bar does not specifically protect these regions.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a sports helmet not having a rigid chin bar which provides protection at least for a portion of the user's face.

This object is achieved by a sports helmet having at least the features of claim 1.

The sports helmet according to the invention comprises a shock-absorbing helmet shell and a strap fixing system for fixing the helmet shell to a user's head. The sports helmet comprises an airbag device comprising at least one gas generator and at least one airbag which is inflatable by gas, wherein the at least one airbag is configured to protect at least a portion of the user's face in an inflated state.

The invention is based on the following consideration: known sports helmets already offer good protection of the user's head. However, in some falls, the facial region of the user is problematic. However, protection of the facial region by rigid devices such as for example a chin bar, a face visor or the like is not desired by many users, since a sports helmet should offer as free a field of vision as possible and should be as easy as possible to put on. Aesthetic considerations also play a role for many users in deciding whether or in which situations even to wear a sports helmet, which may ultimately be at the expense of safety. In equestrian sports, for example, it is absolutely unusual to wear a riding helmet with a chin bar. However, in order to nevertheless protect the face region or at least parts of the user's face region even with sports helmets not having a rigid chin bar, the sports helmet may comprise an airbag device. For example, airbags are proven devices in the automotive field to provide a user with added protection in addition to seatbelts and to protect the user from injuries caused by an impact against hard parts, such as a steering wheel or a dashboard.

The airbag device of the sports helmet according to the invention may comprise several components. An airbag, which may be configured in particular from a flexible plastic material such as, for example, polyamide, may be held in readiness in a folded state. When a dangerous situation is detected, such as the user falling from a bicycle or a horse, the airbag is filled in a short time (e.g. < 1/10 second) with a gas from the gas generator. In this context, the term “gas” is to be understood broadly and may comprise only a single gas (e.g. nitrogen) or a mixture of gases (e.g. an argon-helium mixture) including air or a gas/air mixture. The gas out of or from the gas generator may in particular come directly from the gas generator (e.g. be stored in the gas generator or be generated in the gas generator from a liquid or solid), or the gas for the airbag may be taken from the ambient air by the gas generator (e.g. by pumping and/or compressing). For this purpose, the gas generator may be fluidly (i.e. flow-technically) connected to the airbag.

Thus, the gas generator provides the gas for filling the airbag, wherein the gas generator may be configured, for example, as a cold gas generator or as a pyrotechnic gas generator or as a combination thereof, or as a pump and/or as a compressor. In some embodiments, the gas generator may be realized as a cartridge and/or a pressure accumulator.

In the inflated i.e. filled state, the airbag can protect at least a portion of the user's face depending on its geometric design and arrangement at the helmet shell. In the inflated state, the airbag, due to its arrangement, shape and flexible structure, forms a protective cushion that, in the event of an impact, may come to rest between a region of the user's face and an object (e.g., the ground). The airbag may cushion an impact and/or ensure a planar distribution of forces so as to mitigate excessive force and/or peak loads in the user's facial region. For this purpose, it may be sufficient for the airbag to occupy a predetermined shape in the inflated state for only a short period of time (e.g. approximately one or more seconds), but thereafter to slacken. However, the airbag may also be configured to occupy the predetermined form of the inflated state for a longer period of time.

In some embodiments, the airbag may be configured to cover a chin region (lower jaw) and/or regions of the user's cheekbones in the inflated state. In this context, a covering may be understood as a radial envelope of a portion of the user's head, in particular the face, with the airbag, wherein a clearance between a surface of the face and the airbag in the radial viewing direction remains. In this model, the user's head is assumed to be substantially spherical.

In some embodiments, the airbag may be configured such that in the inflated state at a side facing the user's face it is modelled to correspond to a human face. For example, the airbag may be configured as a curved shape in the manner of a chin bar and/or as curved cheek portions on either side of the user's nose. In particular, the airbag may comprise a cutout of a nose region of the user's face; through such a cutout the shape of the user's face may be replicated, wherein the airbag in the inflated state may cover with a small clearance the surrounding regions of the face.

In some embodiments, the airbag may be formed from a transparent material. A transparent material may be understood to mean a see-through material, i.e. the user can see through the airbag when in the inflated state. This may bring particular advantages when the airbag in the inflated state is in the user's field of vision. In some embodiments, the airbag in the inflated state may thus cover the user's entire facial region, wherein the user may see through the transparent material of the airbag and thus perceive the surroundings.

In some embodiments, the airbag may be configured to leave out an eye region of the user in the inflated state. Thus, a largely unobstructed field of vision of the user may also be maintained through a cutout of the airbag around the user's eye region. For this purpose, the region around the eyes of the user may be left free in the inflated state of the airbag, i.e. the region around the user's eyes is not covered by the airbag in the inflated state.

In some embodiments, the gas generator may be arranged in a center-symmetrical position, in particular at an occipital region of the helmet shell. Such a center-symmetrical arrangement may be advantageous, particularly for embodiments of the airbag device having only a single gas generator, in order to achieve a substantially center-symmetrical weight distribution of the airbag device. In the context of the invention, the term center-symmetrical is to be understood as follows: the sports helmet may be divided into a left-half and a right-half by a center plane of symmetry, wherein the center plane of symmetry is perpendicular to a horizontal plane and is oriented in a longitudinal direction of the sports helmet, i.e. includes a longitudinal axis of the sports helmet.

In some embodiments, the airbag device may comprise two airbags. The two airbags may cover different regions of the user's face. Various embodiments of the airbag device having two airbags are explained below.

In one such embodiment, the two airbags may be configured to cover a portion of the user's face starting from a left side and another portion of the user's face starting from a right side. The two airbags may be arranged respectively at the left side of the sports helmet and at the right side of the sports helmet, for example at side temple regions of the user.

The covering of the respective part of the user's face by the two airbags may take place simultaneously, i.e. the airbag device may thus be configured to fill the two airbags simultaneously with gas. Through this, an undesired transfer of torque to the user's head due to the filling of the airbags may be prevented, in particular if the two airbags are arranged and aligned center-symmetrically.

However, in some embodiments, a slight time-offset may be provided between the inflation of one airbag and the inflation of the other airbag, i.e. one of the two airbags is filled with gas prior in time to the other of the two airbags. In embodiments where the two inflated airbags should cover one another (i.e. overlap), a time-offset filling of the two airbags may prevent the two airbags from meeting and repelling each other during deployment.

In some embodiments, the two airbags may be configured to be center-symmetrically arranged in the inflated state and, for example, on impact, to rest against one another so as to form a substantially closed surface that covers a portion of the user's face.

In some embodiments, however, the two airbags may be configured that in the inflated state each of the two airbags crosses a center plane of symmetry of the sports helmet. Through the respective crossing of the center plane of symmetry, which may be defined as described above, the two airbags overlap at least partially either next to one another or one on top of the other (in particular with respect to a front view of the sports helmet). This, for example, may avoid a straight-line dividing plane running between the two inflated airbags along which the two airbags could be spread apart in the event of an impact and could expose a previously covered area of the user's face. For example, the two airbags may be configured such that, in the inflated state the two airbags engage with each other when the two airbags have crossed the center plane of symmetry.

In some embodiments, the airbag device may comprise a single common gas generator for inflating the two airbags. The common gas generator may be fluidly connected to the two airbags via a respective connecting conduit. The common gas generator may be arranged in particular center-symmetrical at the helmet shell. On the one hand, this may have advantages with regard to a weight distribution of the gas generator at the sports helmet as explained above, and, on the other hand, with regard to a noise development arising from an igniting of the gas generator. By a central arrangement of the gas generator, the gas generator may be arranged at a large distance from the user's ears.

In some embodiments, the airbag device may comprise two gas generators, wherein one of the two gas generators is fluidly connected to one of the two airbags and the other of the two gas generators is fluidly connected to the other of the two airbags. When two gas generators are used, they may be configured to be correspondingly smaller, i.e. with a smaller geometric dimension than when a single gas generator is used. Also with regard to a uniform weight distribution, two gas generators may provide advantages over a single gas generator. In addition, the use of two gas generators may also be advantageous with regards to system redundancy. Furthermore, in some embodiments, the airbag device may also comprise a plurality of gas generators.

In some such embodiments, one of the two gas generators may be arranged at a left side of the helmet shell and the other of the two gas generators may be arranged at a right side of the helmet shell. This may benefit a center-symmetrical weight distribution of the gas generators.

In some embodiments, the two gas generators may be arranged at a respective ear region or at a respective temple region or at a respective lateral neck region (occipital region) of the helmet shell. When the gas generators are arranged in a rear region of the helmet shell and the airbags are however arranged in a front region of the helmet shell, connecting conduits from the respective gas generator to the associated airbag may be provided and may run, for example, along or within the helmet shell.

In some embodiments, the helmet shell may comprise an integrated frame structure. For example, the helmet shell may comprise a so-called skeleton made of plastic that is molded over or foamed around so as to form a shock-absorbing helmet body (e.g., using the so-called in-mold method). The frame structure may comprise one or more strips (flexible or rigid), strap(s) and/or anchors, which extend at least partially within the helmet shell. In such embodiments, the at least one gas generator and/or the at least one airbag of the airbag device may be mounted at the integrated frame structure of the helmet shell. For this purpose, suitable access points and/or mechanical interfaces may be provided at the frame structure. Through the mounting at a frame structure of the helmet shell, a particularly stable fit of the gas generator and/or the airbag is ensured in particular regarding reaction forces that may occur when inflating the airbag. The mounting of the airbag device to an integrated frame structure may also be advantageous in a retrofit option.

In some embodiments, the airbag device may comprise a sensor device for sensing an impact situation, a trigger for triggering the at least one gas generator, and an energy supply for supplying electrical energy to the sensor device and/or the trigger.

The sensor device of the airbag device may comprise, for example, at least one multi-axis acceleration sensor. Furthermore, the sensor device may comprise an evaluation and triggering circuit. The evaluation and triggering circuit may evaluate data from the at least one acceleration sensor. The evaluation and triggering circuit may be configured, for example, to monitor predetermined threshold values and/or to evaluate temporal acceleration profiles and/or acceleration directions which are indicative of an impending impact, for example due to a fall. For example, the evaluation and triggering circuit may compare data from the at least one sensor with at least one predetermined threshold value. If the sensor data exceeds at least one threshold value, the evaluation and triggering circuit may generate a trigger signal, for example, an electronic signal or an igniting current for the trigger.

The evaluation and triggering circuit is connected to a trigger of the airbag device, for example, an explosive device or an igniter. The trigger signal generated by the evaluation and triggering circuit triggers a filling of the at least one airbag. This may be done, for example, by igniting a pyrotechnic gas generator, wherein a pyrotechnic material burns and the generated gas fills the at least one airbag. Alternatively, a gas stored under pressure in the gas generator may be released, wherein the released gas fills the at least one airbag via at least one connecting conduit. Since during triggering, for example by igniting an explosive device, a bang or a loud noise is caused, the trigger may be provided with sound damping, for example, a cover made of sound-insulating material.

Electrical energy is required to determine and monitor the sensor signals and/or to activate the trigger. For this purpose, the airbag device comprises an electrical energy supply which may be configured as a battery and/or an accumulator. In some embodiments, the accumulator may be rechargeable in particular via a solar cell, which is arranged for example at an outer surface of the helmet shell. As an alternative to electrical activation, activation of the trigger may also take place mechanically, for example via a pressure switch.

In some embodiments, the at least one gas generator, the at least one airbag, the sensor device, the trigger and the energy supply may form a modular unit. By way of the modular unit, the airbag device may be retrofitted, in particular, also for existing sports helmets. For this purpose, an arrangement of the modular unit may in particular be provided at the ear region, which for many sports helmets provides a suitable free space of the helmet shell. In such embodiments, the gas generator and/or the associated trigger may be arranged below the user's ear. The modular unit may be mounted at the helmet shell, for example, by way of clip connectors or screw solutions.

In such an embodiment, the modular unit may be detachably, in particular replaceably, mounted at the helmet shell. The mounting of the modular unit may be provided for example at an outer edge of the helmet shell, i.e. at a transition between an inner side and an outer side of the helmet shell. A mechanical interface for mounting the modular unit may be configured at the helmet shell, for example, as a type of anchor. Thus, the modular unit may easily be selectively retrofitted.

In some embodiments, the sports helmet may be configured without a rigid chin bar. It is particularly advantageous if a sports helmet of the widely used type not having a rigid chin bar is given increased protection of the user's facial region as a result of the airbag device according to the invention.

In some embodiments, the helmet shell may comprise a helmet body having padding on the inner side and/or an outer shell on the outer side. The outer shell may also perform a protective function (e.g. absorbing shock or reducing the coefficient of friction for a sliding of the helmet along a rough surface), or it may fulfil substantially just a decorative function. The outer shell may comprise a shell, for example of acrylonitrile butadiene styrene (ABS), or comprise a film, for example of polyvinyl chloride (PVC), polyethylene terephthalate (PET) or a polycarbonate (PC).

In some embodiments, the helmet body may be made of a hard foam, in particular from an expanded polystyrene hard foam (EPS). In other embodiments, a part of the helmet shell, in particular the helmet body, may be manufactured by 3D-printing. In other embodiments, the helmet shell may be formed by a so-called injection-molding mesh.

In some embodiments, the strap fixing system may be mounted to an occipital region of the helmet shell and to lateral temple regions of the helmet shell. In some embodiments, the strap fixing system may comprise a length adjustment device at the neck region of the user.

In some embodiments, the helmet shell may comprise a plurality of ventilation openings distributed over the surface of the helmet shell.

DRAWINGS

The invention is described below by way of examples of embodiments with reference to the drawings in which:

FIG. 1 shows a perspective view of a bicycle helmet;

FIG. 2 shows a front view of an airbag in an inflated state;

FIG. 3 shows a front view of a further embodiment of an airbag in an inflated state;

FIG. 4 shows a front view of a further embodiment of an airbag in an inflated state;

FIG. 5 shows a front view of two airbags in an inflated state;

FIG. 6 shows a front view of a bicycle helmet with two overlapping airbags in an inflated state;

FIG. 7 shows a schematic overhead view of two overlapping airbags;

FIG. 8 shows a front view of a further embodiment of a bicycle helmet with two overlapping airbags in an inflated state;

FIG. 9 shows an overhead view of a bicycle helmet; and

FIG. 10 shows a perspective view of a bicycle helmet with a modular unit of an airbag device.

DESCRIPTION OF THE INVENTIONS

FIG. 1 shows a sports helmet in the form of a bicycle helmet 10 having a shock-absorbing helmet shell 12 and a strap fixing system 14 for fixing the helmet shell 12 to the head of a user (not shown). The helmet shell 12 may comprise a helmet body comprising a padding on the inner side and/or a thin outer shell on the outer side. The helmet body of the helmet shell 12 may be made of a hard foam, in particular an expanded polystyrene hard foam (EPS). The strap fixing system 14 may be mounted at a neck region 40 of the helmet shell 12 and at the lateral temple regions 42 of the helmet shell 12. In some embodiments, the strap fixing system 14 at the neck region 40 of the user may comprise a ring section with a length adjustment device (not shown). The helmet shell 12 may comprise a plurality of ventilation openings 13 distributed over the surface of the helmet shell 12.

The bicycle helmet 10 comprises an airbag device 16, wherein the airbag device 16 comprises at least one gas generator 18 and at least one airbag 20 inflatable by gas from the gas generator 18. The gas generator 18 and the airbag 20 may be arranged in close proximity to each other at the temple region 42 of the bicycle helmet 10 (FIG. 1 ). In some embodiments, the gas generator 18 and the airbag 20 may also be spatially separated, arranged at any location on the bicycle helmet 10 and fluidly connected via a respective connecting conduit. For example, the gas generator 18, or a plurality of gas generators 18, may be arranged at a front end, i.e. at a forehead region 44, at an upper head region 50 or at an occipital region 38 of the bicycle helmet 10. To reduce a moment of inertia of the gas generator 18 resulting from a distance to a pivotal point, for example the neck of the user, an arrangement of the gas generator 18 in particular at the neck region 40 may be provided.

The airbag 20 is schematically shown in FIG. 1 in a non-inflated state, i.e. the airbag 20 is not filled with gas and is arranged in a space-saving manner, for example folded, in a housing, a cover or a suitable storage device at the bicycle helmet 10, in particular at the helmet shell 12. The airbag 20 may be filled with gas from the gas generator 18 in a short time so as to occupy an inflated state and in the inflated state to occupy a predetermined shape. The airbag 20 is configured so that in the inflated state, at least a portion of the user's face 30 is covered (see e.g. FIGS. 2 to 4 ) and thus offers protection against a frontal impact. In order to achieve this protection, the airbag 20 may be mounted in a predetermined orientation, for example, at one of the lateral temple regions 42 or at the forehead region 44 of the bicycle helmet 10, in particular at the helmet shell 12. The respective airbag 20 may comprise a mounting end with which the airbag 20 is mounted at the helmet shell 12 in a predetermined orientation. The respective airbag 20 may further comprise at least one free end which moves along the user's face 30 by the inflation of the airbag 20 so that the inflated airbag 20 covers the face 30. Additionally, in particular during a first phase of deployment, the airbag 20 may move at least partially along a forward direction, i.e. along a longitudinal axis of the bicycle helmet 10. Optionally, in the inflated state, the airbag 20 at a side facing the user's face 30 may be modeled (e.g. curved) according to a human face shape, so as to cover with a closely contoured shape the user's face 30.

FIG. 2 shows in a schematic representation a front view of an airbag 20 in an inflated state. For better orientation, a user's face 30 is also shown schematically. For greater clarity, the bicycle helmet 10 is not shown in FIG. 2 (and correspondingly also not shown in FIGS. 3, 4 and 5 ). However, it is understood that the airbag 20 is arranged at a suitable position of the helmet shell 12 of the bicycle helmet 10, as described above. In the exemplary embodiment according to FIG. 2 , the airbag 20 covers at least a portion of the user's face 30. In particular, the airbag 20 covers a chin region 32 and a left and right cheekbone region 34 of the user's face 30. The airbag 20 may include a cutout 58 of a nose region 46 of the user's face 30. By way of the cutout 58, the shape of the user's face may be replicated, and the airbag 20 in the inflated state may cover with a small clearance the surrounding regions of the face 30. The outline of the cutout 58 is closed at three sides and open only at the top (for the bridge of the nose).

FIG. 3 shows a further embodiment of an airbag 20 in an inflated state. Compared to the embodiment of FIG. 2 , the airbag 20 covers in particular the chin region 32 of a user's face 30 and thus substantially fulfills the function of a chin bar. The chin region 32 (lower jaw) may be particularly vulnerable in the event of the user having a fall. The embodiment of the airbag 20 shown in FIG. 3 may protect the chin region 32 of the user, but has a simpler geometric structure than, for example, the embodiment of FIG. 2 described above. In the inflated state, the airbag 20 may be configured as a convexly curved, substantially rectangular surface. Alternatively, the airbag 20 may be constructed to be tubular in shape, replicating a chin bar.

FIG. 4 shows a further embodiment of an airbag 20 in an inflated state. In this embodiment, the airbag 20 covers almost the entire face 30 of the user, wherein only an eye region 36 is not covered. In addition to the above described chin region 32 and cheekbone regions 34, the airbag 20 also covers a forehead region 44 and lateral temple regions 42 of the user's face 30. Only the eye region 36 of the face 30 is not covered by the airbag 20 due to a cutout 60 of the airbag 20, i.e. the eye region 36 is left free. This embodiment has the advantage that, on the one hand, almost all regions of the face 30 are covered by the airbag 20 and, for example in the event of a fall, are thus protected. On the other hand, due to the cutout 60 of the airbag 20 it is still possible for the user to orient himself even when the airbag 20 is inflated, since a user's minimal field of vision is substantially kept free by the airbag 20. In this context, the term “substantially” means that edge regions of the field of vision may be covered by the airbag 20 in the inflated state.

In an alternative embodiment to the embodiment described in FIG. 4 , the cutout 58 of the airbag 20 may also be omitted, i.e. the airbag 20 covers the entire user's face 30. In this case in particular, it is advantageous if the airbag 20 is configured entirely or partially from a transparent material. This still makes it possible for the user to orient himself even when the airbag 20 is in the inflated state, since he can see through the transparent material of the airbag 20. In the other described embodiments, a transparent design of the airbag 20 is also possible. Alternatively to such a transparent design, in the various embodiments it may also be provided for that the airbag 20 slackens again after inflation (for example, after about one second), for example as a result of specifically introduced pressure-reducing openings.

The airbags 20 shown in FIGS. 2 to 4 may be configured as a single-piece and may be mounted, for example, at one of the temple regions 42 of the helmet shell 12. Alternatively, the covering of the user's face 30 shown in FIGS. 2 to 4 however, may be accomplished also by two complementary airbags 20. In the following, embodiments of an airbag device 18 comprising two airbags 20 are described.

FIG. 5 shows a front view of two airbags 20 in an inflated state, wherein the two airbags 20 are configured to cover a portion of the user's face 30 starting from a left side 51 and another portion of the user's face 30 starting from a right side 52. The left side 51 and the right side 52 are thus defined, as described above, by the center plane of symmetry E, which centrally divides in a vertical direction the bicycle helmet 10 (in the representation according to FIG. 5 , perpendicular to the plane of the paper). The two airbags 20 may be configured such that in the inflated state they meet in the center plane of symmetry E and cover at least the chin region 32 and the cheekbone regions 34 of the user's face 30, wherein the nose region 46 is left out by a respective cutout 58 of the respective airbag 20. The airbags 20 may also only cover the chin region 32. This corresponds to the above described embodiments in FIG. 2 and in FIG. 3 , wherein the airbag 20 is shown there as a single-piece.

Through the meeting of the two airbags 20, a gap 54 may be formed at the center plane of symmetry E. However, the airbags 20 may be configured so as to strongly press against each other at the center plane of symmetry E that the gap 54 is closed by the forces acting substantially perpendicular to the center plane of symmetry E. Thus, a region of the face 30 where the two airbags 20 meet, in particular the chin region 32, may also be completely covered by the two airbags 20.

FIG. 6 shows a front view of a further embodiment of the bicycle helmet 10 according to the invention. The bicycle helmet 10 comprises an airbag device 16 (not shown) with two airbags 20 overlapping in the inflated state. In an inflated state, each of the two airbags 20 crosses the center plane of symmetry E of the bicycle helmet 10, so that in the region of the center plane of symmetry E a region of the user's face 30 is covered by both airbags 20. This can be advantageous since, due to the overlapping of the two airbags 20, in the event of an impact in the region of the center plane of symmetry E the two overlapping airbags 20 do not expose the chin region 32.

In this embodiment, the airbag device 16 may comprise two gas generators 18. One of the two gas generators 18 may be arranged at a left side 51 of the helmet shell 12 and may be fluidly connected to one of the two airbags 20 so as to inflate this airbag 20 when needed. The other of the two gas generators 18 may be arranged at a right side 52 of the helmet shell 12 and fluidly connected to the other of the two airbags 20 so as to inflate this other airbag 20 when needed. The two gas generators 18 may be arranged, for example, at a respective ear region 48 or at a respective temple region 42 or at a respective lateral neck region 40 of the bicycle helmet 10. Of advantage is a symmetrical arrangement of the two gas generators 18 with respect to the center plane of symmetry E of the bicycle helmet 10. The terms of a left side 51 and a right side 52 only serve to distinguish two sides and do not limit the features described with respect to the left side 51 and the right side 52 to these sides, i.e. the features with respect to the left side 51 may also be features with respect to the right side 52, and vice versa.

FIG. 7 shows a schematic overhead view of two overlapping airbags 20 formed by tubular-shaped elements. The two airbags 20 overlap in a region of the center plane of symmetry E. In order to ensure that when the two airbags meet, in particular the two free ends 56 of the respective airbags 20, that the two airbags 20 slide past each other, the two ends 56 of the airbags 20 which meet may also have, for example, a trapezoidal structure or a chamfer.

FIG. 8 shows a further embodiment of two overlapping airbags 20. In this case, the overlapping does not occur as one on top of the other, but rather side by side, i.e. in a front view, the two airbags 20 do not overlap or cover each other, although each of the two airbags 20 crosses the center plane of symmetry E of the bicycle helmet 10. With this embodiment, it can be achieved for example, that the chin region 32 is completely covered by one of the two airbags 20 and for example, a mouth region 49 of the user is covered by the other of the two airbags 20.

In an alternative embodiment, the bicycle helmet 10 or airbag device 16 may comprise a single common gas generator 18 for inflating the two airbags 20, wherein the single gas generator 18 is fluidly connected to both airbags. Gas can thus flow from the single gas generator 18 into both airbags 20. As described above, the single gas generator 18 may be arranged in a center-symmetrical position, i.e. symmetrical with respect to the center plane of symmetry E, for example at an occipital region 38 of the helmet shell 12. However, it is also possible for the single gas generator 18 to be arranged at any position symmetrical to the center plane of symmetry E, for example at a forehead region 44 of the helmet shell 12.

FIG. 9 shows an top view of a bicycle helmet 10. A center plane of symmetry E may divide the bicycle helmet 10 symmetrically into a left side 51 and a right side 52. The gas generator 18 may be arranged at various locations in a center-symmetrical position. By a center-symmetrical arrangement of the gas generator 18, a symmetrical weight distribution with respect to the center plane of symmetry E may be achieved, which may result in increased wearing comfort for the user. As described above, the gas generator 18 may also be arranged center-symmetrical with respect to the center plane of symmetry E in the forehead region 44 or center-symmetrical with respect to the center plane of symmetry E in the neck region 40 or center-symmetrical with respect to the center plane of symmetry E in the upper head region 50. Corresponding arrangements are shown with a dashed line in FIG. 9 .

FIG. 10 shows a perspective view of a bicycle helmet 10 having a modular unit 28 of an airbag device 16. The airbag device 16 may comprise a sensor device 22 for detecting an impact situation, a trigger 24 for triggering the at least one gas generator 18 and an energy supply 26 for supplying electrical energy to the sensor device 22 and/or the trigger 24. Together with an airbag 20 (shown in FIG. 10 in a folded state), the sensor device 22, the trigger 24, the gas generator 18 and the energy supply 26 may be arranged at the bicycle helmet 10 as a modular unit 28. This may allow retrofitting of an airbag device 16 to existing bicycle helmets 10 (additive design). However, the sensor device 22, the trigger 24, the gas generator 18, the energy supply 26 and the airbag 20 may also be arranged in a distributed manner at the bicycle helmet 10, which may also be referred to as an integrative design.

The operation of the airbag device 16 may be described by way of example, by the following steps. The sensor device 22 continuously monitors, for example at regular time intervals, relevant parameters that may describe a fall or an impact threatened thereby. For example, detected acceleration values may be used as a criterion for a fall if these exceed predefined threshold values, wherein in particular a direction-dependent evaluation may be performed. For this purpose, the sensor device 22 compares the values measured by at least one sensor with predefined threshold values. If at least one measured parameter exceeds the associated threshold value, the sensor device 22 sends a trigger signal to a trigger 24. The signal may be formed, for example, by an electrical pulse that causes a gas stored in at least one gas generator 18 to flow out. This may be caused, for example, by the ignition of an explosive device at the gas generator 18. The gas flows into the associated airbag 20 via at least one connecting conduit which connects the respective gas generator 18 with an associated airbag 20. Due to the inflow of the gas, the airbag 20 unfolds and the airbag 20 is suddenly almost fully inflated. The airbag 20 unfolds around the user's face 30 such that the inflated airbag 20 covers at least portions of the user's face 30.

Energy is required both to monitor the measured values by the sensing device 22 and also to ignite the trigger 24. This energy may be provided by an electrical energy supply 26. The energy supply 26 may be configured as a battery or as an accumulator. If an accumulator is used as the energy supply, the accumulator may be supplied with energy optionally via solar units that may be arranged at a surface of an outer side of the helmet shell 12.

With regard to the embodiments in accordance with the drawings, it should also be noted that the invention may also be applied to a different type of sports helmet, in particular a motorcycle helmet, a riding helmet or a ski helmet. 

What is claimed is:
 1. A sports helmet having a shock-absorbing helmet shell and a strap fixing system for fixing the helmet shell to the head of a user, wherein the sports helmet comprises an airbag device which includes at least one gas generator and at least one airbag which is inflatable by gas, wherein the at least one airbag is configured to protect at least a portion of the user's face in an inflated state.
 2. The sports helmet according to claim 1, wherein the airbag is configured to cover a user's chin region and/or regions of the cheekbones in the inflated state.
 3. The sports helmet according to claim 1, wherein the airbag is configured to be modeled according to a human face shape at a side facing the face of the user in the inflated state.
 4. The sports helmet according to claim 3, wherein the airbag comprises a cutout of a nose region of the user's face.
 5. The sports helmet according to claim 1, wherein the airbag is formed form a transparent material which is see-through such that the user can look through the airbag when the airbag is in the inflated state.
 6. The sports helmet according to claim 1, wherein the airbag is configured to leave out a user's eye region in the inflated state.
 7. The sports helmet according to claim 1, wherein the gas generator is arranged at a center-symmetrical position and/or an occipital region of the helmet shell.
 8. The sports helmet according to claim 1, wherein the airbag device comprises two airbags.
 9. The sports helmet according to claim 8, wherein the two airbags are configured to cover a portion of the user's face starting from a left side and another portion of the user's face starting from a right side.
 10. The sports helmet according to claim 8, wherein the two airbags are configured such that, in the inflated state, each of the two airbags crosses a center plane of symmetry of the sports helmet.
 11. The sports helmet according to claim 10, wherein the two airbags at least partially overlap either next to each other or on top of each other.
 12. The sports helmet according to claim 8, wherein the airbag device comprises a single common gas generator for inflating the two airbags.
 13. The sports helmet according to claim 8, wherein the airbag device comprises two gas generators, wherein one of the two gas generators is fluidly connected to one of the two airbags and the other of the two gas generators is fluidly connected to the other of the two airbags.
 14. The sports helmet according to claim 13, wherein one of the two gas generators is arranged at a left side of the helmet shell and the other of the two gas generators is arranged at a right side of the helmet shell.
 15. The sports helmet according to claim 13, wherein the two gas generators are arranged at a respective ear region or at a respective temple region or at a respective lateral neck region of the helmet shell.
 16. The sports helmet according to claim 1, wherein the helmet shell comprises an integrated frame structure, wherein the at least one gas generator and/or the at least one airbag is mounted at the integrated frame structure.
 17. The sports helmet according to claim 1, wherein the airbag device comprises a sensor device for detecting an impact situation, a trigger for triggering the at least one gas generator and an energy supply for supplying the sensor device and/or the trigger with electrical energy.
 18. The sports helmet according to claim 17, wherein the at least one gas generator, the at least one airbag, the sensor device, the trigger and the energy supply form a modular unit.
 19. The sports helmet according to claim 18, wherein the modular unit is removably mounted at the helmet shell.
 20. The sports helmet according to claim 1, wherein the sports helmet is configured as a bicycle helmet, wherein the helmet shell comprises a helmet body which is made of a hard foam and which comprises a padding at an inner side and/or an outer shell at an outer side, and wherein the helmet shell comprises a plurality of ventilation openings distributed over the surface of the helmet shell. 